Start Angle and Direction

This example demonstrates different sector layout angles and directions.

By default, ChartDirector positions sectors starting from the upward pointing position, and in clockwise direction.

The start angle and layout direction can be changed using PieChart.setStartAngle.

One common application for PieChart.setStartAngle is to facilitate layout of pie charts containing many small sectors. Please refer to Side Label Layout for an example.

[JSP Version] jspdemo/anglepie.jsp

<%@page import="ChartDirector.*, java.util.*" %>
<%!
// Function to create the demo charts
void createChart(WebChartViewer viewer, int chartIndex)
{
    // The data for the pie chart
    double[] data = {25, 18, 15, 12, 8, 30, 35};

    // The labels for the pie chart
    String[] labels = {"Labor", "Licenses", "Taxes", "Legal", "Insurance", "Facilities",
        "Production"};

    // Create a PieChart object of size 280 x 240 pixels
    PieChart c = new PieChart(280, 240);

    // Set the center of the pie at (140, 130) and the radius to 80 pixels
    c.setPieSize(140, 130, 80);

    // Add a title to the pie to show the start angle and direction
    if (chartIndex == 0) {
        c.addTitle("Start Angle = 0 degrees\nDirection = Clockwise");
    } else {
        c.addTitle("Start Angle = 90 degrees\nDirection = AntiClockwise");
        c.setStartAngle(90, false);
    }

    // Draw the pie in 3D
    c.set3D();

    // Set the pie data and the pie labels
    c.setData(data, labels);

    // Explode the 1st sector (index = 0)
    c.setExplode(0);

    // Output the chart
    viewer.setChart(c, Chart.SVG);

    // Include tool tip for the chart
    viewer.setImageMap(c.getHTMLImageMap("", "", "title='{label}: US${value}K ({percent}%)'"));
}
%>
<%
// This example includes 2 charts
WebChartViewer[] viewers = new WebChartViewer[2];
for (int i = 0; i < viewers.length; ++i) {
    viewers[i] = new WebChartViewer(request, "chart" + i);
    createChart(viewers[i], i);
}
%>
<!DOCTYPE html>
<html>
<head>
    <title>Start Angle and Direction</title>
    <!-- Include ChartDirector Javascript Library to support chart interactions -->
    <script type="text/javascript" src="cdjcv.js"></script>
</head>
<body style="margin:5px 0px 0px 5px">
    <div style="font:bold 18pt verdana;">
        Start Angle and Direction
    </div>
    <hr style="border:solid 1px #000080; background:#000080" />
    <div style="font:10pt verdana; margin-bottom:1.5em">
        <a href="viewsource.jsp?file=<%=request.getServletPath()%>">View Source Code</a>
    </div>
    <!-- ****** Here are the chart images ****** -->
    <%
        for (int i = 0; i < viewers.length; ++i) {
            out.write(viewers[i].renderHTML(response));
            out.write(" ");
        }
    %>
</body>
</html>